The correct options are
A In western Alaska, very large winter tents are made by placing heavy walrus skins over wood frames.
B Snow houses are used only in the eastern and central regions.
C The rear bench is covered with animal skins and is used for sleeping.
In summer, most Eskimos live in tents made of animal skins. In western Alaska, very large winter tents are made by placing heavy walrus skins over wood frames. Snow houses are used only in the eastern and central regions. They are made from blocks of packed snow, built into a dome.